The following table is the specifications for two hard disk drives, Seaget andWesdigital.CharacteristicsСарасityAverage seek timeSpindle speedBytes per sectorNo. of sector per trackSeaget1.5 TBWesdigital1 TB12 ms8000 грm10 ms10000 rpm600500500600i.Calculate the total average access time for each hard disk to transfer 250MB of data assuming both are organized sequentially.

It is defined as a hard drive or fixed disk. It is said to be rigid magnetic disc that stores data.…

The following table is the specifications for two hard disk drives, Seaget and Wesdigital. Characteristics Сарасily Average seek time Spindle speed Bytes per sector No. of sector per track Seaget 1.5 TB 10 ms 10000 rpm 600 500 Wesdigital 1 TB 12 ms 8000 грm 500 600 Calculate the total average access time for each hard disk to transfer 250 MB of data assuming both are organized seguentially.

The following table is the specifications for two hard disk drives, Seaget and Wesdigital. Characteristics Сарасily Average seek time Spindle speed Bytes per sector No. of sector per track Seaget 1.5 TB 10 ms 10000 rpm 600 500 Wesdigital 1 TB 12 ms 8000 грm 500 600 Calculate the total average access time for each hard disk to transfer 250 MB of data assuming both are organized seguentially.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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A 2.5 Inch diameter disk has 8 platters with each platter having two data recording surfaces, each platter on disk has 4084 tracks, each track has 400 sectors and one sector can store 1 MB of data. Calculate the storage capacity of this disk in Bytes. If this disk has a seek time of 2 milli-seconds and rotates at the speed of 6000 rpm, find the Access time for the disk. Make suitable assumptions, if any.
Transfer rate of a disk drive can be no faster than the bit density (bits/track) times the rotational speed of the disk. Figure 7.15 gives a data transfer rate of 112GB/sec. Assume that the average track length of the disk is 5.5 inches. What is the average bit density of the disk?
A manufacture wishes to design a hard disk with a capacity of 60 GB or more (using thestandard definition of 1GB = 230 bytes). If the technology used to manufacture thedisks allows 512-bytes sectors, 1024 sector/track, and 60% tracks/ platter, how many platters are required?
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A manufacture wishes to design a hard disk with a capacity of 60 GB or more (using thestandard definition of 1GB = 230 bytes). If the technology used to manufacture thedisks allows 512-bytes sectors, 1024 sector/track, and 60% tracks/ platter, how manyplatters are required?
Consider a disk with 2 MB/track, a rotation time of 10 msec, average seek time of 5 msec. On average, how long it takes to read 500 bytes from the disk?
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A hard disk with a transfer rate of 20 MBps is constantly transferring data to memory using DMA. The processor runs at 400 MHz and takes 300 and 700 clock cycles to initiate and complete DMA transfer respectively. If the size of the transfer is 60 Kbytes, what is the percentage of processor time consumed for the transfer operation?
A disk has 1024 sectors/track and 4096 bits/sector. Assuming a rotation rate of 10,200 RPM, calculate the sustained transfer rate of the disk over one track.
A hard disk with a transfer rate of 10 M bytes/ second is constantly transferring data to memory using DMA. The processor runs at 600 MHz, and takes 300 and 900 clock cycles to initiate and complete DMA transfer respectively. If the size of the transfer is 20 Kbytes, what is the percentage of processor time consumed for the transfer operation?
Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stored in a bit serial manner in a sector. Calculate the capacity of the disk pack and the number of bits required to specify a particular sector in the disk.
Suppose that a magnetic dick drive has the following characteristics: Rotational speed = 20000 RPM HTH switching time = 3 ms Average TTT seek time = 3 ms 6 platters, 1024 tracks per platter side recorded on both sides, 60 sectors per track on all tracks. Sector size = 512. The Questions are as following: What is the drive’s storage capacity? How long it will take to read the drive’s entire contents sequentially?